基于任务剖面的单相Boost型功率解耦光伏逆变器寿命预测

摘要

A method based on mission profile is proposed for predicting the lifetime of the single- phase Boost power decoupling photovoltaic grid-connected inverter. Firstly, the annual solar irradiance and ambient temperature of the installation site are taken as the mission profile, and the junction temperature data of IGBT under different operation conditions are obtained through thermal model simulation by PLECS. Then, the corresponding IGBT junction temperature profile under a yearly mission profile of the installation point is simulated by using the interpolation look-up table method. The lifetime of a single IGBT is predicted by the junction temperature cycle lifetime model. Finally, the distribution function of IGBT's lifetime is calculated through Monte Carlo method, and the lifetime distribution of the inverter system is predicted by the reliability evaluation block diagram of the series system. The simulation results show that the lifetime distribution of the inverter is no less than 5 years, which meets the ISO9001 quality management system certification. ? 2022, Solar Energy Periodical Office Co., Ltd. All right reserved.

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